Assuming they go into the shell large side down with no card wad over them, I'm wondering if they aren't someone's idea of a crude "spreader" wad. They might be designed to push a bit harder on the center and spread shot a bit to the outside. Or... perhaps that smaller section serves as a bit of a cushion to reduce recoil just a little? That might work with or w/o a card wad over it. Anyone have a better idea? Regardless of what they're designed for, they'd make great kindling for a woodstove or perhaps, soaked in liquid smoke, fuel for a BBQ???.... and, no, I haven't been tipping a bottle....
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